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Enthalpy of mixing of liquid Cu–Fe–Hf alloys at 1 873 K

Pavel Agraval, Liya Dreval and Mikhail Turchanin

Abstract

In the ternary Cu–Fe–Hf system, the mixing enthalpies of liquid alloys were investigated at 1873 K using a high-temperature isoperibolic calorimeter. The experiments were performed along the sections xCu/xFe = 3/1, 1/1 at xHf = 0–0.47 and along the section xCu/xFe = 1/3 at xHf = 0–0.13. The limiting partial enthalpies of mixing of undercooled liquid hafnium in liquid Cu–Fe alloys, ΔmixH¯Hf, are (−122 ± 9) kJ mol−1 (section xCu/xFe = 3/1), (−106 ± 9) kJ mol−1 (section xCu/xFe = 1/1), and (−105 ± 2) kJ mol−1 (section xCu/xFe = 1/3). In the investigated composition range, the integral mixing enthalpies are sign-changing. For the integral mixing enthalpy, an analytical expression was obtained by the least squares fit of the experimental results using the Redlich–Kister–Muggianu polynomial.


*Correspondence address, Dr. Liya Dreval, Metallurgical Department, Donbass State Engineering Academy, Shkadinova (Akademichnaya) Street 72, UA-84313 Kramatorsk, Ukraine, Tel.: +497116771242, Fax: +497116771248, E-mail: , Web: https://www.researchgate.net/profile/L_Dreval

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Received: 2016-08-07
Accepted: 2016-09-06
Published Online: 2016-11-25
Published in Print: 2016-12-08

© 2016, Carl Hanser Verlag, München